Huawei P20 Lite 2019 User Manual page 51

Use Tail Light Trails to Capture the Lights of the City
Tail light trails lets you create artistic photos of car tail lights at night.
Shoot from a distance and slightly above your subject for best results. Ensure that car
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headlights do not point directly at the camera, as this can overexpose the image.
Place your device on a tripod or solid surface so that it does not move during the exposure.
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Open Camera > More > Light painting > Traffic trails. Hold your Phone steady, and then
touch to start shooting. A preview of the image is displayed in the viewfinder. Touch
you are finished.
Camera
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